261202643 has 8 divisors (see below), whose sum is σ = 281528688. Its totient is φ = 240909984.

The previous prime is 261202589. The next prime is 261202657. The reversal of 261202643 is 346202162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261202643 - 2¹² = 261198547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261202243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9305 + ... + 24677.

It is an arithmetic number, because the mean of its divisors is an integer number (35191086).

Almost surely, 2^261202643 is an apocalyptic number.

261202643 is a deficient number, since it is larger than the sum of its proper divisors (20326045).

261202643 is a wasteful number, since it uses less digits than its factorization.

261202643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16693.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 261202643 is about 16161.7648479366. The cubic root of 261202643 is about 639.2330028848.

The spelling of 261202643 in words is "two hundred sixty-one million, two hundred two thousand, six hundred forty-three".